Optimum Nutrition Gold Standard Isolate supplement bottle
Optimum Nutrition

Gold Standard Isolate

What We Researched
· 6 inactive ingredients decoded · 9 brand certifications checked · Last updated: Mar 2026
81
Product Score Good
92
Brand Score Excellent

Product Analysis

Transparency Fair

Supplement Facts

No supplement facts data available.

Bioavailability N/A

Absorption Rating

No ingredient forms matched our reference database.

Other Ingredients Excellent

Fillers & Additives

  • Soy Lecithin
  • Flavourings [MILK]
  • Fat-Reduced Cocoa Powder
  • Sodium Chloride
  • Xanthan Gum
  • Sucralose
Efficacy N/A

Dosage Analysis

Dosage data not available for assessment.

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Soy Lecithin Safe

Helps blend oil and water-based ingredients. Common allergen.

Flavourings [MILK] Unknown
Fat-Reduced Cocoa Powder Unknown
Sodium Chloride Safe

Provides sodium, stabilizes formulations.

Xanthan Gum Safe

Thickens and stabilizes liquid and semi-solid supplements.

Sucralose Generally_safe

Adds sweetness to chewables, gummies, and powdered supplements without calories.

Brand Trust Report
Optimum Nutrition

Founded 1986 · Downers Grove, IL, United States · 95 products · optimumnutrition.com

Certifications

9 certifications
Consumerlab Verified Source
Informed Sport Verified Source
Labdoor Verified Source
Nsf Certified For Sport Verified Source
Usda Organic Verified Source
Vegan Certified Verified Source
Fda Gmp Inspections Verified Source
Non Gmo Project Verified Source
Nsf Gmp Verified Source

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed Source
In House Testing — Verified Source

Violation History

5 incidents
Prop 65 Lead2025-07-21Source
Prop 65 Lead2024-11-22Source
Recall Various nutritional and beverage products2022-07-28Source
Prop 65 Lead2017-03-10Source
Lawsuit Deceptive claims about the plant-based enzyme 'Aminogen' and its effect on protein digestion and absorption.2013Source
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Frequently Asked Questions
Is Optimum Nutrition Gold Standard Isolate a good supplement?

Optimum Nutrition Gold Standard Isolate received a product quality score of 81/100 in GoodSupp's independent analysis, indicating strong overall quality. Of the 6 inactive ingredients, 3 are rated safe and 0 are flagged for review. The manufacturer, Optimum Nutrition, holds a brand trust score of 92/100 with 9 verified certifications including Consumerlab, Informed Sport, Labdoor, Nsf Certified For Sport.

Is Optimum Nutrition Gold Standard Isolate safe to take?

Optimum Nutrition Gold Standard Isolate has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Optimum Nutrition a trustworthy supplement brand?

Optimum Nutrition receives a brand trust score of 92/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1986 and headquartered in Downers Grove, IL, United States, the company offers 95 products in their lineup. They hold 9 verified certifications including Consumerlab, Informed Sport, Labdoor, Nsf Certified For Sport. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Optimum Nutrition has 5 historical regulatory incidents on record, which are factored into the trust score.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.